Pin for venting cores



(No Model.)

J. KINZER.

PIN EUR VENTING Goms.

Patented June 17 fur a Il WITNESSES: l

INVENTOR Ny PETERS, Pudo-Lithography. wnsningiom D. C,

" 4UNITED STATES PATENT OFFICE.

JACOB KINZER, 'OF PITTSBURG, PENNSYLVANIA.

PIN FOR VEN-FING CORES.

l SPECIFICATION forming part of Letters Patent No. 300,480, dated June 17, 1884.

replication ined Maren el, 1884. (No monti.)

ToaZZ w/wm it may concern,.-

Be it known that I, 'JACOB KINZER, a citiaen of the United States, residing at Pittsburg, 1n the county of Allegheny and State of Penn sylvania, have invented or discovered a certain new and useful Improvement in Venting Core- Pins, of which improvement the following is a specification. f

In the accompanying drawings,which make part of this specification, Figure lis a sectional elevation of a half-mold and core-box, showing In making what is known as depending cores from green sand, it is necessary, when such coresare long and of small diameter, to strengthen them and anchor or secure them to the main body of the mold. This has been effected either by forming the core around one end of a pin or wire, the opposite end being thrust in the inain body of the mold, or by thrusting a wire through the mainbody of the mold into the core; and, further, it is necessary that these green-sand cores should be vented, so as to allow of the escape of gases when the metal is cast. This ventin g is effected by pricking the finished mold with aventing-wire. In the case oflong and small cores it very frequently happens that the venting-wire turns y aside and strikes against the sides of the corebox, thus forming an opening to the outside of the core, which will cause a defect in the casting.

The object of my invention is to provide for the proper anchoring and strengthening of a core and also its thorough and safe venting; and to this end my invention consists inthe construction and combination of parts, all as more fully hereinafter described and claimed. The core pin orrod consists of la tapering nail-like body, 1, the larger end being spread on two sides to forni the head 2, and the small end being pointed, as shown. In the two sides the beveled surfaces are formed the transverse serrations 4, said serrations being arranged alternately on adjacent surfaces, 'as clearly shown in Figs. l and 2.

The vent-former 5 consists of a piece of wire bent into staple shape, the upper or closed end of the wire being strengthened by the body of metal, 6, which is cast in between and onto the arms of the vent-former. This body of metal 6 not only strengthens the vent-former, but holds the arms thereof parallel and acts as a stop to prevent the ends of the wire from projecting beyond the end of the core-pin when the vent-former is slipped onto the core-pin. This body of metal is placed at such a distance fromthe free ends of the wire, which are pointed, as shown, that these points will,when the pin and vent-former are put together, be

in close proximity to the point of the pin,and

the lower end of the part 6 will rest in the notch in the end of the pin. The filling-piece 6 should extend to or nearly tothe upper end of the vent-former, for the purpose to be here inafter stated. l

In using my venting core-pin I first form the core 7, and into this core is thrust the core-pin and vent-former, which has been previously slipped into the grooves in the core-pin, as shown inFig. l. The core-pin andvent-former are pushed into the core until the lower end of the pin nearly reaches the end of the core, as shown. The main body of the mold is then formed around the head ofthe core-pin and the upper end of the vent-former, which should be sufficiently long to protrude a short distance above the surface of the mold.

After the main portion of the mold is formed the vent-former is i is no danger of the sides of the core being` broken by the core-pin, and as the vent-former is held within the grooves in the core-.pin and IOO is thrust in with the core-pin there is no lia.- bility of its being diverted and puneturing the outer surface of the core.

In place of thrusting the core-pin and ventformer into the core together, I may rst platee the core-pin in position and then slide the ventformer down along the grooves in the core-pin; or in this latter oase I may use two separate lengths of Wire, thrusting one down the groove on one side ofthe oore-pin and the other length down the other groove.

I claim herein as my inventiong l. A core-pin provided with longitudinal side grooves, in combination with al stapleA shaped Wire, constructed to fit within said 15 grooves, substantially as s et forth.

42. A. eore-pinfprovided with-longitudinal side grooves7 in combination with the ventformer consisting of a staple-shaped Wire and a body of metal uniting and filling the' upper o portion ofsaid staple, substantially as set forth.

In testimony whereof I have hereuntoset my hand.

'JACOB KINZER.'

W'itnesses:

DARWIN S. VoLooTT, R. H. WHITTLESEY. 

